Chronometer-escapement.



Patented Mar. 24, 191i ATTORNEYS COLUMBIA PLANOGRAPH CO.,WASH1NGTON. x). c.

WILLIAM E. WALKER, OF WOODSTOCK, OHIO.

CHRONOMETER-VESCAPEME-NT.

Specification of Letters Patent.

Patented Mar. 24, 1914.

Application filed July 22, 1913. Serial No. 780,468,

To all whom it may concern Be itknown that 1, WILLIAM E. WALKER, a citizen of the United States, and a resident of \Voodstock, in the county of Champaign and State of Ohio, have made certain new and useful Improvements in Ghronometer- Escapements, of which the following is a specification.

My present invention has to do with the escapement of chronometers, my object being to provide a detached escapement 1n which the balance receives impulse direct from the teeth of the escape-wheel without the use of guard pins, banking pins or springs, and which will effectively perform its function in the face of hard or rough usage.

With the above in mind, my invention resides in the features of construction, ar rangement and, operation to be now described with respect to the accompanying drawing, wherein Figure 1 is a plan view of the escapement. Fig. 2 is a similar view showing the detent in released position, and Fig. 3 is a side elevation of the parts shown in Fig. 2. 7

Referring now to these figures, A indicates the usual balance, beneath the hub a of which is mounted the table B and beneath which table is mounted the detent controlling cam C.

The escape wheel D is mounted in aplane below the balance A and above the table B, the latter having an upwardly projecting pallet 1) extending into the plane of the escape wheel and so located with respect thereto as that, during the oscillations of the bal ance, it will move within the circumferential limits of the escape wheel.

Adjacent to the periphery of the escape wheel D is the detent E, this detent being intermediately mounted on and connected to a staff F and having extending arms upon opposite sides of said staff, one arm 6 being in the form of an inwardly curved tail and the other arm 0' having an outer head provided with a V-shaped notch in its end.

The staff F carries a tapering finger G, the free end of which is acted upon by the controlling cam C, and is also provided with a counter balancing arm H having openings for the reception of poising weights or screws.

Starting now with the movement of the balance A and table B in the direction of arrow 10 in Figs. 1 and 2, the cam G strikes and moves finger G, rocking the notched arm 0 of detent E out of engagement with the tooth d of escape wheel D. At practically the instant tooth (Z is released, pallet Z) will have moved to a position where tooth cl of the escape will, during movement of the same, strike said pallet and thus give an impulse to the balance. The energy of this impulse is, however, soon expended in the usual hair spring tension, which then starts the balance wheel in its opposite movement and during this latter movement cam C again strikes finger G which results in the movement of the notched arm 6 toward the escape wheel. In the meantime, tooth (Z in advance of the tooth d which was released, strikes the inwardly curved detent arm 6, throwing its notched end inwardly to engage the succeeding tooth d so that when the detent is moved by cam C striking finger G, the escape wheel will be moved backward slightly as toot-h (Z is forced up the outer sloping wall of the detent notch. Then when the cam C moves by finger G, tooth (l is free to move to the center of the detent notch, thus bringing the escape wheel to normal position.

From the foregoing it may be readily understood that it is impossible for the notched arm of the detent to move in and out before the succeeding tooth of the escapement comes in proper position for engagement sufficient to defeat such engagement of said succeeding tooth therewith, the velocity of the detent being less than that of the escape wheel. It is to be observed therefore, in view of the above and the correct poising of the detent by its counter balancing arm H, that this escapement will effectively operate in the face of sudden motion in any direction and hard or rough handling.

I claim:

1. The combination of an escape wheel, a balance having a controlling cam and an impulse member with which the escape wheel engages when released, and an intermediately pivoted detent having oppositely extending arms one of which is curved inwardly toward the escape wheel and the other of which has a V-shaped notch in its end in which the teeth of the escape wheel are received, and a finger extending from the detent for engagement by the controlling cam.

2. The combination with an escape wheel,

of .a controlling detent therefor arranged adjacent to, and in the same plane therewith, and comprising an intermediately pivoted member having one end provided with a V- shaped notch which receives a tooth of the of a controlling detent therefor comprising a member pivoted between its ends, one end having a tooth receiving notch and the other end having a smooth surface on which the teeth of the escape wheel may ride to move detentwheel, and having its opposite end the notched end toward the escape wheel.

curved inwardly toward the escape wheel to contact with a tooth thereof, whereby to move the notched end in one direction.

3. The combination with an escape wheel,

XVILLIAM E. WALKER;

Witnesses S. hi. OVERFIELD,

WV. HOWARD SHARP.

Copies 0! this patent may be obtained for five cents each, by addrening' the Commissioner of Patents, Washington, D. G. 

